Owner of this DCU says this: “Anyway, the point is I absolutely love my ARE DCU. If you get one, go with the vertical sidewalls and the “radius” front, like I did. That way, you don’t lose any interior room from the slope/angle on the sidewalls.”

Sounds like good advice, but his cap is 30″. I want 36″ of headroom. The air drag would eat gas. The other aluminum solution, the wedge, goes from 30″ to 36″ and would eat less gas. I do like that the owner of the DCU above has an aluminum ladder rack on top of the cap. That is a plus for the gas eater. Storage for tarp and poles and shovel.

What is really holding me back on the roomier one is proportion/aesthetics. I like the looks of the wedge. I think that the 36″ straight sided one looks wrong. Silly way to make this decision.